That’s the airline name as registered at Companies House but I totally agree that LBA should be using and showing the name everyone recognises and uses easyJet (with the spelling the airline uses). For information there’s also easyJet plc whose activity is shown as Head Office operations.What is bugging me is that on the LBA website they have easyJet down as Easyjet Airline Company Limited, honestly don't think it looks great at all, it should be easyJet not Easyjet, not EasyJet not Easyjet Airline Company Limited but easyJet..!!!
